Which tool is specifically designed to fit into grooved handles?

The correct answer is the microblade core. This tool is specifically designed to produce microblades that can be used in conjunction with grooved handles, allowing for a secure fit. The microblade technology involves creating small, sharp blades that can be affixed to tools or handles, enhancing their effectiveness for various tasks. This adaptability is crucial in understanding how early humans utilized specific tool-making techniques to improve their efficiency and effectiveness in various activities.

In contrast, the Mousterian backed knife, chopper, and Abbevillian handaxe do not emphasize compatibility with grooved handles. The Mousterian backed knife typically has a flat profile suited for specific cutting tasks, while the chopper is a more robust, heavy-duty tool without grooves for attachment. The Abbevillian handaxe, although versatile, primarily serves as a multipurpose cutting tool rather than one that integrates with grooved handles. Thus, the microblade core stands out as specifically designed for such applications.